Publish iCal calendars with local WebDAV server

To publish your iCal Calendar with the bundled OS X Apache web server, edit Apache’s configuration file in /etc/httpd. You must be root, so I expect you know vi and the workings of this file in general.
% sudo vi /etc/httpd/htttpd.conf
In the Shared Library section, where modules are loaded, add these two lines in the [...]

Domain Name Service (DNS) – What is DNS?

The Internet system that translates human-understandable hostnames (like www.ozarweb.com) into computer-understandable IP addresses (like 85.108.12.214) and back again.
Think of it as the Internet phonebook.